Swim exercise fin



FIG. 1 is a perspective view of a swim exercise fin showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left elevational view thereof;

FIG. 5 is a right elevational view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7. is a bottom plan view thereof. 

The ornamental design for a swim exercise fin, as shown. 